Skip to content

Spot Light Shadow

Video Lecture

Spot Light Shadow Spot Light Shadow Spot Light Shadow

Description

The Spot Light Shadow uses a PerspectiveCamera frustum to calculate the shadows.

The PerspectiveCamera defaults are

Direction Value
near 0.5
far If the owning spotlight distance is set higher than 0, it will use that, otherwise it uses the default 500
fov the angle property of the owning spotlight via the update method
aspect aspect of the mapSize, default 512/512 = 1

Possible renderer.shadowMap.type values

Type Value
BasicShadowMap gives unfiltered shadow maps - fastest, but lowest quality.
PCFShadowMap (Default) filters shadow maps using the Percentage-Closer Filtering (PCF) algorithm (default).
PCFSoftShadowMap filters shadow maps using the Percentage-Closer Soft Shadows (PCSS) algorithm.
VSMShadowMap filters shadow maps using the Variance Shadow Map (VSM) algorithm. When using VSMShadowMap all shadow receivers will also cast shadows.

Start Script

./src/client/client.ts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'three/examples/jsm/libs/dat.gui.module'

const scene = new THREE.Scene()
scene.add(new THREE.AxesHelper(5))

const light = new THREE.SpotLight()
// light.castShadow = true;
// light.shadow.mapSize.width = 512;
// light.shadow.mapSize.height = 512;
// light.shadow.camera.near = 0.5;
// light.shadow.camera.far = 100
scene.add(light)

const helper = new THREE.SpotLightHelper(light)
//const helper = new THREE.CameraHelper(light.shadow.camera);
scene.add(helper)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 7

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
//renderer.shadowMap.enabled = true
//renderer.shadowMap.type = THREE.PCFSoftShadowMap
//renderer.shadowMap.type = THREE.BasicShadowMap
//renderer.shadowMap.type = THREE.PCFShadowMap
//renderer.shadowMap.type = THREE.VSMShadowMap
document.body.appendChild(renderer.domElement)

new OrbitControls(camera, renderer.domElement)

const planeGeometry = new THREE.PlaneGeometry(100, 20)
const plane = new THREE.Mesh(planeGeometry, new THREE.MeshPhongMaterial())
plane.rotateX(-Math.PI / 2)
plane.position.y = -1.75
//plane.receiveShadow = true;
scene.add(plane)

const torusGeometry = [
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
]

const material = [
    new THREE.MeshBasicMaterial(),
    new THREE.MeshLambertMaterial(),
    new THREE.MeshPhongMaterial(),
    new THREE.MeshPhysicalMaterial({}),
    new THREE.MeshToonMaterial(),
]

const torus = [
    new THREE.Mesh(torusGeometry[0], material[0]),
    new THREE.Mesh(torusGeometry[1], material[1]),
    new THREE.Mesh(torusGeometry[2], material[2]),
    new THREE.Mesh(torusGeometry[3], material[3]),
    new THREE.Mesh(torusGeometry[4], material[4]),
]

const texture = new THREE.TextureLoader().load('img/grid.png')
material[0].map = texture
material[1].map = texture
material[2].map = texture
material[3].map = texture
material[4].map = texture

torus[0].position.x = -8
torus[1].position.x = -4
torus[2].position.x = 0
torus[3].position.x = 4
torus[4].position.x = 8

// torus[0].castShadow = true
// torus[1].castShadow = true
// torus[2].castShadow = true
// torus[3].castShadow = true
// torus[4].castShadow = true

// torus[0].receiveShadow = true
// torus[1].receiveShadow = true
// torus[2].receiveShadow = true
// torus[3].receiveShadow = true
// torus[4].receiveShadow = true

scene.add(torus[0])
scene.add(torus[1])
scene.add(torus[2])
scene.add(torus[3])
scene.add(torus[4])

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight
    camera.updateProjectionMatrix()
    renderer.setSize(window.innerWidth, window.innerHeight)
    render()
}

const stats = Stats()
document.body.appendChild(stats.dom)

const data = {
    color: light.color.getHex(),
    mapsEnabled: true,
    //shadowMapSizeWidth: 512,
    //shadowMapSizeHeight: 512,
}

const gui = new GUI()
const lightFolder = gui.addFolder('THREE.Light')
lightFolder.addColor(data, 'color').onChange(() => {
    light.color.setHex(Number(data.color.toString().replace('#', '0x')))
})
lightFolder.add(light, 'intensity', 0, 1, 0.01)

const spotLightFolder = gui.addFolder('THREE.SpotLight')
spotLightFolder.add(light, 'distance', 0, 100, 0.01)
spotLightFolder.add(light, 'decay', 0, 4, 0.1)
spotLightFolder.add(light, 'angle', 0, 1, 0.1)
spotLightFolder.add(light, 'penumbra', 0, 1, 0.1)
//spotLightFolder.add(light.shadow.camera, "near", 0.1, 100).onChange(() => light.shadow.camera.updateProjectionMatrix())
//spotLightFolder.add(light.shadow.camera, "far", 0.1, 100).onChange(() => light.shadow.camera.updateProjectionMatrix())
//spotLightFolder.add(data, "shadowMapSizeWidth", [256, 512, 1024, 2048, 4096]).onChange(() => updateShadowMapSize())
//spotLightFolder.add(data, "shadowMapSizeHeight", [256, 512, 1024, 2048, 4096]).onChange(() => updateShadowMapSize())
spotLightFolder.add(light.position, 'x', -50, 50, 0.01)
spotLightFolder.add(light.position, 'y', -50, 50, 0.01)
spotLightFolder.add(light.position, 'z', -50, 50, 0.01)
spotLightFolder.open()

// function updateShadowMapSize() {
//     light.shadow.mapSize.width = data.shadowMapSizeWidth
//     light.shadow.mapSize.height = data.shadowMapSizeHeight
//     ;(light.shadow.map as any) = null
// }

const meshesFolder = gui.addFolder('Meshes')
meshesFolder.add(data, 'mapsEnabled').onChange(() => {
    material.forEach((m) => {
        if (data.mapsEnabled) {
            m.map = texture
        } else {
            m.map = null
        }
        m.needsUpdate = true
    })
})

function animate() {
    requestAnimationFrame(animate)

    helper.update()

    torus.forEach((t) => {
        t.rotation.y += 0.01
    })

    render()

    stats.update()
}

function render() {
    renderer.render(scene, camera)
}

animate()

Final Script

./src/client/client.ts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import Stats from 'three/examples/jsm/libs/stats.module'
import { GUI } from 'three/examples/jsm/libs/dat.gui.module'

const scene = new THREE.Scene()
scene.add(new THREE.AxesHelper(5))

const light = new THREE.SpotLight()
light.castShadow = true
light.shadow.mapSize.width = 512
light.shadow.mapSize.height = 512
light.shadow.camera.near = 0.5
light.shadow.camera.far = 100
scene.add(light)

//const helper = new THREE.SpotLightHelper(light)
const helper = new THREE.CameraHelper(light.shadow.camera)
scene.add(helper)

const camera = new THREE.PerspectiveCamera(
    75,
    window.innerWidth / window.innerHeight,
    0.1,
    1000
)
camera.position.z = 7

const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
renderer.shadowMap.enabled = true
renderer.shadowMap.type = THREE.PCFSoftShadowMap
//renderer.shadowMap.type = THREE.BasicShadowMap
//renderer.shadowMap.type = THREE.PCFShadowMap
//renderer.shadowMap.type = THREE.VSMShadowMap
document.body.appendChild(renderer.domElement)

new OrbitControls(camera, renderer.domElement)

const planeGeometry = new THREE.PlaneGeometry(100, 20)
const plane = new THREE.Mesh(planeGeometry, new THREE.MeshPhongMaterial())
plane.rotateX(-Math.PI / 2)
plane.position.y = -1.75
plane.receiveShadow = true
scene.add(plane)

const torusGeometry = [
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
    new THREE.TorusGeometry(),
]

const material = [
    new THREE.MeshBasicMaterial(),
    new THREE.MeshLambertMaterial(),
    new THREE.MeshPhongMaterial(),
    new THREE.MeshPhysicalMaterial({}),
    new THREE.MeshToonMaterial(),
]

const torus = [
    new THREE.Mesh(torusGeometry[0], material[0]),
    new THREE.Mesh(torusGeometry[1], material[1]),
    new THREE.Mesh(torusGeometry[2], material[2]),
    new THREE.Mesh(torusGeometry[3], material[3]),
    new THREE.Mesh(torusGeometry[4], material[4]),
]

const texture = new THREE.TextureLoader().load('img/grid.png')
material[0].map = texture
material[1].map = texture
material[2].map = texture
material[3].map = texture
material[4].map = texture

torus[0].position.x = -8
torus[1].position.x = -4
torus[2].position.x = 0
torus[3].position.x = 4
torus[4].position.x = 8

torus[0].castShadow = true
torus[1].castShadow = true
torus[2].castShadow = true
torus[3].castShadow = true
torus[4].castShadow = true

torus[0].receiveShadow = true
torus[1].receiveShadow = true
torus[2].receiveShadow = true
torus[3].receiveShadow = true
torus[4].receiveShadow = true

scene.add(torus[0])
scene.add(torus[1])
scene.add(torus[2])
scene.add(torus[3])
scene.add(torus[4])

window.addEventListener('resize', onWindowResize, false)
function onWindowResize() {
    camera.aspect = window.innerWidth / window.innerHeight
    camera.updateProjectionMatrix()
    renderer.setSize(window.innerWidth, window.innerHeight)
    render()
}

const stats = Stats()
document.body.appendChild(stats.dom)

const data = {
    color: light.color.getHex(),
    mapsEnabled: true,
    shadowMapSizeWidth: 512,
    shadowMapSizeHeight: 512,
}

const gui = new GUI()
const lightFolder = gui.addFolder('THREE.Light')
lightFolder.addColor(data, 'color').onChange(() => {
    light.color.setHex(Number(data.color.toString().replace('#', '0x')))
})
lightFolder.add(light, 'intensity', 0, 1, 0.01)

const spotLightFolder = gui.addFolder('THREE.SpotLight')
spotLightFolder.add(light, 'distance', 0, 100, 0.01)
spotLightFolder.add(light, 'decay', 0, 4, 0.1)
spotLightFolder.add(light, 'angle', 0, 1, 0.1)
spotLightFolder.add(light, 'penumbra', 0, 1, 0.1)
spotLightFolder
    .add(light.shadow.camera, 'near', 0.1, 100)
    .onChange(() => light.shadow.camera.updateProjectionMatrix())
spotLightFolder
    .add(light.shadow.camera, 'far', 0.1, 100)
    .onChange(() => light.shadow.camera.updateProjectionMatrix())
spotLightFolder
    .add(data, 'shadowMapSizeWidth', [256, 512, 1024, 2048, 4096])
    .onChange(() => updateShadowMapSize())
spotLightFolder
    .add(data, 'shadowMapSizeHeight', [256, 512, 1024, 2048, 4096])
    .onChange(() => updateShadowMapSize())
spotLightFolder.add(light.position, 'x', -50, 50, 0.01)
spotLightFolder.add(light.position, 'y', -50, 50, 0.01)
spotLightFolder.add(light.position, 'z', -50, 50, 0.01)
spotLightFolder.open()

function updateShadowMapSize() {
    light.shadow.mapSize.width = data.shadowMapSizeWidth
    light.shadow.mapSize.height = data.shadowMapSizeHeight
    ;(light.shadow.map as any) = null
}

const meshesFolder = gui.addFolder('Meshes')
meshesFolder.add(data, 'mapsEnabled').onChange(() => {
    material.forEach((m) => {
        if (data.mapsEnabled) {
            m.map = texture
        } else {
            m.map = null
        }
        m.needsUpdate = true
    })
})

function animate() {
    requestAnimationFrame(animate)

    helper.update()

    torus.forEach((t) => {
        t.rotation.y += 0.01
    })

    render()

    stats.update()
}

function render() {
    renderer.render(scene, camera)
}

animate()